[A1n_d2n] [EXTERNAL] Singularity path issue impacting analysis -- Reminder of /site, /apps outage on Tuesday

[Brad Sawatzky]

Hi Mingyu, et al,

It looks like there were some backwards-incompatible changes to
/apps/singularity/ on Friday.  I think the relevant software is still
there, but symlinks need to be made to allow existing code to work
with the new configuration.

I'm CC'ing the group and Sylvester so we all have a heads-up.  I emailed
the IT person in charge and asked that symlinks be restored for now
(along with a reminder that notice of regressions should be given via
scicomp-briefs in the future).  I expect that symlinks will be restored
quickly.  I recommend that folks just wait until tomorrow rather than
make local fixes.

FWIW, it looks like the new standard path will be
  /apps/singularity/3.5.2
instead of 
  /apps/singularity/singularity-3.5.2
It looks like IT is also moving towards using the 'module' system.  That
is a good thing in the long run.

Sylvester may want to make the change to invoke the relevant IT module
when he can, or wait a bit and see how this all settles out.

REMINDER:  I'll also take this opportunity to remind everyone of the
  /apps and /site planned outage scheduled that starts Tuesday
  afternoon.  This was posted to the scicomp-briefs list last week.
  More details are here:
    https://mailman.jlab.org/pipermail/jlab-scicomp-briefs/2020q4/000824.html
  Hopefully there is nothing in particular you need to do, but do be
  aware that may be a significant service disruption that evening.

  Note that I will be disabling the /site and /apps mountpoints on
  the Hall C Cluster machines Monday night and restoring them on Wed
  morning.  (Hopefully no one is analyzing on the Hall C machines
  anymore though.)

-- Brad

On Sun, 15 Nov 2020, mingyu at jlab.org wrote:

> Hi Brad,
> I encountered a strange problem with hallc_replay. Up to yestoday
> (11/14/2020), both hallc replay and root works fine on JLab
> ifarm. However, today after I load the PolHe3 software environment:
> $ source /group/c-polhe3/software/setup.sh
> when I do:
> $ root -l
> I get this message:
> $ /group/c-polhe3/software/opt/hallac_container_1.8/bin/root: line 19:
> /apps/singularity/singularity-3.5.2/bin/singularity: No such file or
> directory
> I am not sure what cause the missing file to prevent root run properly
> after setting up the PolHe3 software environment, could you take a look?
> Attached screen shot has the details of this problem.
> Sincerely,
> Mingyu Chen
> 
> 
> 
> > Hi folks,
> >
> > I meant to send this out earlier -- sorry for the delay.
> >   https://hallcweb.jlab.org/wiki/index.php/Pol3He_Analyzer_Git_HowTo
> >
> > Murchhana kindly beta-tested the instructions for me, so I hope they
> > work for everyone.  Do let me know if you hit problems or have
> > questions.
> >
> > There are many ways to work with git.  The basic idea here is basically
> > the same as the github 'fork and pull request' workflow.  That is
> > outlined on the link above.  You can find more detailed descriptions at
> > the 'Git Howto' page at the bottom of the above link, and/or skim
> > this quick article.
> >   https://urldefense.proofpoint.com/v2/url?u=https-3A__reflectoring.io_github-2Dfork-2Dand-2Dpull_&d=DwIBAg&c=CJqEzB1piLOyyvZjb8YUQw&r=BiQgYHr0DbfJNsNM2SdXVw&m=WwDXAOZOy-7KJ4LXBpGJ9JYIE4pWk1qs6GuiLAYLS40&s=TbHBqpzhWF9h1-_mRXkfUe6_9FtTLrGf-JVvWePorxg&e= 
> >
> > (Note that we are using the ANL GitLab server and /not/ GitHub for our
> > work.  Don't worry though, the process is basically the same.)
> >
> > -- Brad

-- 
Brad Sawatzky, PhD <brads at jlab.org>  -<>-  Jefferson Lab / Hall C / C111
Ph: 757-269-5947  -<>-  Fax: 757-269-5235  -<>- Pager: brads-page at jlab.org
The most exciting phrase to hear in science, the one that heralds new
  discoveries, is not "Eureka!" but "That's funny..."   -- Isaac Asimov